| A | B |
|---|
| astronomical unit | unit used to measure distance in the solar system |
| black dwarf | remains of a white dwarf that has no fuel |
| light year | the distance light travels in 1 year |
| space station | a spacecraft that stays in orbit for long periods |
| nebula | a huge cloud of dust and gases |
| black hole | small region in space caused by collapse of a massive star |
| gravity | force that attracts objects to the center of the earth |
| space shuttle | space craft that carries passengers and equipment into space |
| super nova | violent explosion of a high mass star |
| rocket | space craft with a powerful engine |
| constellation | a group of stars that form a picture |
| white dwarf | an old very dense star |
| red giant | an old star that has expanded and cooled |
| neutron star | small dense star |
